#11.2 写个匹配成绩的⼩程序，成绩有ABCDE 5个等级，与分数的对应关系如下
# A 90-100
# B 80-89
# C 60-79
# D 40-59
# E 0-39
# 要求⽤户输⼊0-100的数字后，你能正确打印他的对应成绩等级，⽐如输⼊的是75，则打印C

score = int(input("请输入成绩："));
# print("你的等级是：")
if score >=90 and score <=100:
    print("A")
elif score >=80 and score <=89:
    print("B")
elif score >=60 and score <=79:
    print("C")
elif score >=40 and score <=59:
    print("D")
else:
    print("E")
